Which of the following chemicals attach to pathogens and label them as foreign bodies to be destroyed by the immune system?

• A. Cytokines
• B. Histamines
• C. Antibodies
• D. Interferons

Answer: (C)

Verified step by step guidance

1. Understand the role of each chemical listed in the problem: Cytokines, Histamines, Antibodies, and Interferons.
2. Recall that antibodies are proteins produced by B cells of the immune system that specifically bind to antigens on pathogens, effectively labeling them as foreign.
3. Recognize that this labeling by antibodies marks the pathogens for destruction by other immune cells, such as phagocytes.
4. Differentiate antibodies from cytokines, which are signaling molecules; histamines, which mediate inflammation; and interferons, which interfere with viral replication.
5. Conclude that the chemical responsible for attaching to pathogens and labeling them as foreign bodies is antibodies.